DIY PCBs - most common SMT resistor sizes ?

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Dave Kendall
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DIY PCBs - most common SMT resistor sizes ?

Post by Dave Kendall » Fri Mar 06, 2015 1:31 pm

Hi all.

I'd guess at 1206 and 0805, but is there a clear leader?

I'm still happier with through-hole, (for eyesight and existing stocks reasons), but really should get some SM parts in, so as not to miss out on the increasing number of good SMT projects.

(no joy with the search function on this subject for me)

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Post by Jarno » Fri Mar 06, 2015 1:45 pm

For my own boards, meant to be handsoldered, I use 0805 caps on a wide 1206 footprint, for easier soldering. But 1206 components aren't necessary size wise, 0805 works fine (and is used a lot). 0603 is quite a bit smaller, not sure if this is used a lot in diy

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Post by FingerTappin » Fri Mar 06, 2015 1:48 pm

I'm not sure there is a clear leader.

In my experience, I have seen a bunch of 0805. 0805 is doable by hand and therefore found in SMD DIY (I did 128 0805 smd diodes in my monome clone as my first foray into smd). I would think most smd projects around here would use that package.

I haven't seen much 1206, but that could just be me.

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Post by the bad producer » Fri Mar 06, 2015 1:53 pm

I agree with Jarno - for DIY, 0805 parts on 1206 pads is easier when hand-soldering. Easier than either 0805 parts on 0805 pads or 1206 parts on 1206 pads... So when a DIY project calls for 1206 I generally order 0805 parts. Not done 0603 yet, not sure I'll like that!

It looks like - despite having through-hole stock - I'll need to re-order similar parts for SMT, and I'd rather not have to stock two or three different series, so I'll stick with 0805 unless necessary.

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Post by FingerTappin » Fri Mar 06, 2015 1:57 pm

Jarno wrote:For my own boards, meant to be handsoldered, I use 0805 caps on a wide 1206 footprint, for easier soldering. But 1206 components aren't necessary size wise, 0805 works fine (and is used a lot). 0603 is quite a bit smaller, not sure if this is used a lot in diy
Ohhh, that's nice, 0805 on a wide 1206 footprint...

I don't see too much 0603 around in DIY. I feel 0603 is not for the faint of heart. As someone said in another thread, if you sneeze, you just lost a bunch of those 0603 parts. I'd be curious to try the stencil, solder paste, tweezers, hot air gun/oven reflow method at some point. Although, I am finding stencils can be the price of the PCB itself. Regardless, I am about to try and tackle some 0603 SMD with my trusty iron.

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Post by Jack Gull » Fri Mar 06, 2015 3:47 pm

asked this a couple of people myself, they always said to use 0805 because it's easy to solder and cost even less than 1206 (true)
infact, in my next board i'm using all 0805 and SOC (so... super easy)

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Post by daverj » Fri Mar 06, 2015 4:24 pm

The more you get used to soldering SMT, the easier it is to do smaller parts. I do 0603 all the time by hand. But I don't make kits or blank boards for others to solder.

My guess would be 0805 is the best for most DIYers, if you want to stock up on some parts. If you get a board from somewhere that has 1206 footprints, you can solder 0805 on them. And after you do a few of those you'll probably be OK soldering 0805 onto 0805 footprints too.

As more people get used to SMT I'm sure you'll start seeing kits/boards with 0603 on them. At that point you'll need to get some of those parts too. You can still solder them onto 0805 footprints, but not 1206 footprints.

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Post by Dave Kendall » Fri Mar 06, 2015 4:45 pm

Thanks for the replies guys - very helpful. 0805 it is then.

Have done a bit of digging - they're cheap too. £36 inc. VAT gets 100 of each value in E24 from 100R to 1M, with 200 each of 2.2, 3.3 and 4.7 in each decade, and 5000(!) each of 1K, 10K and 100K. and that's from my usual supplier. Not that I really need 5000, 1000 would do, but that's the reel size. Should see me for a while. . . :)

I've seen a few PC boards (CGS43 and some NLC stuff) that have through-hole pads for vertical resistors that can also take SM resistors. Dunno how much more fiddly than regular SM pads that would be, but it certainly looks like a flexible layout for the DIYer.

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Post by negativspace » Fri Mar 06, 2015 5:01 pm

Same as Jarno, I use 0805 but I've lately been using 1206 footprints for easier hand-soldering. It works well!

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Post by mgofmc » Sat Mar 07, 2015 4:50 pm

I may be a weirdo, but I mostly use 0402 or 0603 parts except when I can't get the necessary voltage rating in that size. I solder with a fairly decent Hakko iron, usually with a hoof bit, always under a microscope, and I always use flux. Under a microscope, 0603s are like soldering with house bricks. Seriously, SMD without a microscope is really hard. With one, it is easier than through hole. When you get the hang of drag soldering ICs become ridiculously easy and fast.

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Post by indigoid » Sat Mar 07, 2015 5:33 pm

Mutable Instruments - pretty much all 0603

Nonlinear Circuits - mix of 0805 and some 1206
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Post by paperCUT » Sat Mar 07, 2015 8:55 pm

It's pretty safe to place 0805 on the top layer under an IC socket isn't it? For power filtering they don't seem too tall.

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Post by codeandcopper » Sun Mar 08, 2015 3:02 pm

daverj wrote:The more you get used to soldering SMT, the easier it is to do smaller parts. I do 0603 all the time by hand. But I don't make kits or blank boards for others to solder.
mgofmc wrote:I may be a weirdo, but I mostly use 0402 or 0603 parts except when I can't get the necessary voltage rating in that size. I solder with a fairly decent Hakko iron, usually with a hoof bit, always under a microscope, and I always use flux. Under a microscope, 0603s are like soldering with house bricks. Seriously, SMD without a microscope is really hard. With one, it is easier than through hole. When you get the hang of drag soldering ICs become ridiculously easy and fast.
I'm with these guys. I thought for sure I'd never hand-solder 0402 parts, but after just a little bit of practice, I'm not sure it's any more difficult than 0805. (Just don't sneeze while working.) It's important to have a decent soldering station and tip. Being able to see well is a much bigger issue than steadiness-of-hand.

The space savings of 0402 parts can really add up on a complex design.

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Post by indigoid » Sun Mar 08, 2015 4:19 pm

codeandcopper wrote:The space savings of 0402 parts can really add up on a complex design.
I was wondering about this last night actually, while laying out a board with a bunch of 0805 on it - the first time I'd tried to do this. With PTH you at least have lots of room under parts to run traces etc. I was finding that 0805 pads were wider than the leg pitch of the SOIC opamps on my board. I had to space things out more to fit the traces in, and it was still very messy. I haven't tried it but I expect 0603 would be a lot easier to lay out compactly, so I will redo it. Not game for 0402 yet!
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Post by okelk » Sun Mar 08, 2015 8:32 pm

I never used 0402 parts, but I think 0603 is pretty much the limit of what I can comfortably hand solder without magnification (but good lightening is important!) .

my favorites are 0805. the labeling is easier to read than 0603 and 1206 just seems unnecessarily big.
Also they they fit on big 1206 pads and if you absolutely have to you can squeeze them onto a 0603 pad.

maybe even more important for comfortable hand soldering is the pad size.
...the ones that are hardly bigger than the part itself are really annoying.

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Post by loydb » Sun Mar 08, 2015 10:15 pm

I'm getting ready to build a bunch of Mutable stuff, it sounds like a need a good assortment of 0603 and 0805 to keep on hand. Anyone have a good link for reasonably-priced collections? The Mouser one I like is $450... :woah:

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Re: DIY PCBs - most common SMT resistor sizes ?

Post by gbanfield » Mon Jul 27, 2020 3:32 pm

I'd add that soldering 0603 on 0805 pads can also be really nice for the exact same reason that soldering 0805 on 1206 pads is. I recently built some 0603 stuff which had one or two 0805 caps, and those were the ones I sweated! I have tons of 0603 in stock and NLC pcb's in the mail, figure I'll just stretch out and enjoy the extra pad space when I assemble them (picture that Seinfeld episode when Elaine is driving down the road with the middle lane painted out by Kramer, but without the ensuing danger).

Also, it seems that there are many many cheap and quality 0603 kits for cheap, I haven't found the same true for 0805 (I keep finding 5% resistor kits intead of 1%, poor reviews, etc). If anyone knows of a cheap and easy way to stock up on 0805 in one fell swoop, please let me know!

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Re: DIY PCBs - most common SMT resistor sizes ?

Post by EATyourGUITAR » Tue Jul 28, 2020 9:53 am

I think it is a tie between in 0805 and 0603. I haven't seen 1206 in years. If you are not sure use 0805. If you need the space, use 0603.
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Re:

Post by steviet » Tue Jul 28, 2020 10:45 am

loydb wrote:
Sun Mar 08, 2015 10:15 pm
I'm getting ready to build a bunch of Mutable stuff, it sounds like a need a good assortment of 0603 and 0805 to keep on hand. Anyone have a good link for reasonably-priced collections? The Mouser one I like is $450... :woah:
Search for "resistor/capacitor sample book". I grabbed a cap and resistor set in 0603. Saved me more than few times.
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Re:

Post by EATyourGUITAR » Wed Jul 29, 2020 8:13 am

loydb wrote:
Sun Mar 08, 2015 10:15 pm
I'm getting ready to build a bunch of Mutable stuff, it sounds like a need a good assortment of 0603 and 0805 to keep on hand. Anyone have a good link for reasonably-priced collections? The Mouser one I like is $450... :woah:
$17 for 1000 resistors of the same value. start with 100K and 1K. if it is more rare, buy what you need for $0.03 each. use spreadsheets. get the total. then go shopping for the cheapest resistors you can find that meet your requirements. check to see if the spec is 1/10 watt 1/8 watt 1/4 watt etc.. this must be less than $100 even if you do every mutable module at once.
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